/*

 * Licensed to the Apache Software Foundation (ASF) under one

 * or more contributor license agreements.  See the NOTICE file

 * distributed with this work for additional information

 * regarding copyright ownership.  The ASF licenses this file

 * to you under the Apache License, Version 2.0 (the

 * "License"); you may not use this file except in compliance

 * with the License.  You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

/**

 * Defines {@link com.bff.gaia.unified.sdk.coders.Coder Coders} to specify how data is encoded to and

 * decoded from byte strings.

 *

 * <p>During execution of a Pipeline, elements in a {@link com.bff.gaia.unified.sdk.values.PCollection}

 * may need to be encoded into byte strings. This happens both at the beginning and end of a

 * pipeline when data is read from and written to persistent storage and also during execution of a

 * pipeline when elements are communicated between machines.

 *

 * <p>Exactly when PCollection elements are encoded during execution depends on which {@link

 * com.bff.gaia.unified.sdk.PipelineRunner} is being used and how that runner chooses to execute the

 * pipeline. As such, Unified requires that all PCollections have an appropriate Coder in case it

 * becomes necessary. In many cases, the Coder can be inferred from the available Java type

 * information and the Pipeline's {@link com.bff.gaia.unified.sdk.coders.CoderRegistry}. It can be

 * specified per PCollection via {@link com.bff.gaia.unified.sdk.values.PCollection#setCoder(Coder)} or

 * per type using the {@link com.bff.gaia.unified.sdk.coders.DefaultCoder} annotation.

 *

 * <p>This package provides a number of coders for common types like {@code Integer}, {@code

 * String}, and {@code List}, as well as coders like {@link com.bff.gaia.unified.sdk.coders.AvroCoder}

 * that can be used to encode many custom types.

 */

@DefaultAnnotation(NonNull.class)

package com.bff.gaia.unified.sdk.coders;



import edu.umd.cs.findbugs.annotations.DefaultAnnotation;

import edu.umd.cs.findbugs.annotations.NonNull;